 /*
  * $Header: /cvshome/build/org.osgi.service.component/src/org/osgi/service/component/ComponentException.java,v 1.13 2006/07/11 13:15:56 hargrave Exp $
  *
  * Copyright (c) OSGi Alliance (2004, 2006). All Rights Reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package org.osgi.service.component;

 /**
  * Unchecked exception which may be thrown by the Service Component Runtime.
  *
  * @version $Revision: 1.13 $
  */
 public class ComponentException extends RuntimeException {
     static final long serialVersionUID = -7438212656298726924L;
     /**
      * Nested exception.
      */
     private final Throwable cause;

     /**
      * Construct a new ComponentException with the specified message and cause.
      *
      * @param message The message for the exception.
      * @param cause The cause of the exception. May be <code>null</code>.
      */
     public ComponentException(String message, Throwable cause) {
         super(message);
         this.cause = cause;
     }

     /**
      * Construct a new ComponentException with the specified message.
      *
      * @param message The message for the exception.
      */
     public ComponentException(String message) {
         super(message);
         this.cause = null;
     }

     /**
      * Construct a new ComponentException with the specified cause.
      *
      * @param cause The cause of the exception. May be <code>null</code>.
      */
     public ComponentException(Throwable cause) {
         super();
         this.cause = cause;
     }

     /**
      * Returns the cause of this exception or <code>null</code> if no cause
      * was specified when this exception was created.
      *
      * @return The cause of this exception or <code>null</code> if no cause
      * was specified.
      */
     public Throwable getCause() {
         return cause;
     }

     /**
      * The cause of this exception can only be set when constructed.
      *
      * @param cause Cause of the exception.
      * @return This object.
      * @throws java.lang.IllegalStateException This method will always throw an
      * <code>IllegalStateException</code> since the cause of this
      * exception can only be set when constructed.
      */
     public Throwable initCause(Throwable cause) {
         throw new IllegalStateException ();
     }
 }

